Steam-engine valve.



No. 797,309. PATENTED AUG. l5, 1905. E. F. NEBDHAM 6L Gn W. SMITH STEAM ENGINE VALVE.

APPLICATION FILED JULY 13.1904.

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No. 797,309. PATENTED-AUG.15. 1905.

E. NEEDHAM da G. W. SMITH.

STEAM ENGINE VALVE. APPLIOATION FILED JULY1s.1so4.

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IDVVARD F. NEEDHAIVI AND GEORGIE W. St/IIlll, OF FRT IVAYNIC, INDIANA.

Specification of Letters Patent.

i?atented Aug. l5, 1905.

Application led July 13.1904. Serial No. 2] 6,404.

To 0.1./ whom t nto/ 1J concern:

Be it known that we, EpwAnDF. Nn'nninnn and (luenen W. Siirrn, citizens ot' the United bltates, residing at Fort W ayne, in the/ county oi' Allen, in the State oi' lndiana, have invented certain new and useful Improvements in @team-Engine Valves; and we do hereby de clare that the Following is a i'ull, clear, and eX- act description ot' the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being' had to the accompanying drawings, which form part oi' this specification.

Our invention relates to improvements in steanrengine valves.

The primary object of our present invention is to provide a cheap, simple, ei'iicient, and reliable engine-valve in which the communication between the working cylinder and the steamechamber is controlled by two independently and oppositely movable cut-olii' valves so arranged as to eilect this control in half thetime required in a single piston-valve, thereby materially reducing the usual throttling of the initial steam, and secure the bene- Vtits ot' a large-throw eccentric without excessive wearing of parts.

Our invention consists of two independently and simultaneously movable eut-oil valves in concentric relation and oppositely actuated, the outer valve being tubular and having duplicate ports at its opposite ends in constant communication with the cylindenports, the inner valve being independently movable in the tubular Valve and adapted to alternately open and close the steam-ports oi the tubular valve, and improved means for actuating' the said eut-otll valves simultaneously in opposite directions.

The principal novel feature of our invention resides in the construction arrangement and coijierative relation of the cut-oill valves to each other and to the cylinder-ports.

Similar reference numerals indicate like parts throughout the several views of the drawings, in which- Figure I is a central section through an engine-cylinder and the valve-casing, showing the relative ar 'angement of the cut-oil' valves, steam and exhaust ports. Fig. 2 is an enlarged end view of the tubular cut-oli valve, showing the spider in which the valve-stein :is secured. Fig. 3 is an enlarged detail plan oi" the same, showing' the arrangement oi the steam and exhaust ports. Fig. 4 is an enlarged view of the inner cut-ofi' valve. Fig. 5 is a plan of the same, partly in section.

The cylindewcasting l has the usual or other proper arrangement o'll initial steamducts 2 and exhaust-steam duct-s 3 and a. liig. l., and a cylinder 5, having' a working piston 6 and a piston-rod 7 oi' the usual construction.

In the casting l are rigidly iixed the duplicate tubular valve-casings 8 and Si, closed at their outer ends by the steam-tight heads l() and provided near their outer ends with a series of peripheral exhansteports ll in direct communication with the exhaust-steam d ucts 3 and 4f, respectively, and also provided near their inneil end with a series ol ports i2 and i3, respectively, which are in direct communication with the respective cylinder-ports 'lli and 15. In these \f'al\i'e-casings 8 and S) is slidably mounted the tubular valve 1li, provided at each end with a series oli duplicate. peripheral ports 19 and 20, adapted to be at all times in register with the ports 419. and 13, respectively, ol the valve-casing, and therefore at all times in :ii'ull communication with the respective cyliinlcnports 'lli and i5. "lhe valve 16 is also provided at its central portion with a series oi'` extended peripheral steam-inlet ports i8 in direct communieation with the steani-duct This valve lli is also provided with proper steam-tight packingrings 24C and 25, liig. 3, and has at its iorward end a valve-stem 2T, pre'lerably tubular at its inner end to loosely contain the i'orwardlyextended end oiE the valve-stem 29. oi the inner cut-oiiAA valve about to be described. The outer end of the valve-stem 27 is pivotally connected to one end o'lf the walking-beam 28, which in turn is pivoted midway of its ends on the bracket 29. lhe other end olE this walking-beam is pivotally connected with one end of the operating-rod 30, whose other bent end is pivotally connected to one end oi' a rocker-arm 3l by means olf the pivot Sill. llhe other end oit the arm is pivotally connected with the rocker-shaft S52.

rllhe innercut-oii"ijiistoirvalve2.1, cylindrical in lorm, has upon each end enlarged heads 23, provided with metal packing-rings 26. lhis valve is slida-bly and concentrically mounted in the tubular valve i6 and is adapted to alternately open and close the ports ifi and 2e of the tubular valve. rihe valve 2l has its rear end provided with a \f'alve*stem 2Q, whose outer end is pivotally connected to one end of the short rod 33, whose other end is pivotally connected to the arm 31 by means of the pin 341. The forward end of the valve 21 maybe provided with an extension-stem 35, whose outer end plays loosely in the tubular end of the valve-stein 27 for the purpose of affording a bearing for the valve-stern 27, though the extension 35 is not essential and may be omitted.

The operation of our invention thus described is obviousand, briefly stated, is as follows: When power is applied to the rockershaft 32, it will simultaneously actuate the valves 16 and 21, the former through the medium of the arm 31, the operating-rod 30, the walking-beam 28, and the valve-stem 2T and the latter through the medium of the arm 31, the rod 83, and the valve-stein 22. Ol viously these valves will be oppositely actuated siniultaneously, whereby the opening and closing of the ports 19 and 2O of the tubnlar valve 16 will be effected in one-half the time required for a single valve, as the travel of each of these cutoff valves 16 and 21 in approaching' and receding from each other in action requires of each but one-half the travel which would be required by a single valve. In Fig'. 1 the tubular valve 16 is shown at the forward limit of its movement and the inner cut-olil valve is shown at the rearward limit of its movement, in which position the cylinder is just beginning' to take in initial steam at its rear end and to exhaust at its front end. The next movement of the tubular valve 16 is rearwardly, but only so far as to permit the port-s 19 and 2O to remain in full register with the respective extended ports 12 and 13. The next and simultaneous movement of the valve 21 is forwardly, thereby closing the ports 19 to the exhaust and opening them to live steam, at the same time gradually closing the ports 2O to the live steam and opening them for exhaust. This simultaneous movement of the coacting cutolf valves thus reduces their respective travel, secures a quick, reliable. and efcient action, reduces materially the usual throttling of steam, and specially adapts our invention for high-speed engines.

Having thus described our invention and its mode of operation, what we desire to secure by Letters Patent is- 1. 1n a steam-engine, means for controlling the admission of steam to the piston-cylinder, consisting of a pair of telescoping valves having a simultaneous and opposite reciprocation, and adapted to cut oft the supply of steam at each stroke thereof; and means for actuating' the said valves.

2. An engine-valve for controlling the snpply of steam to the piston-cylinder consisting of a pair of telescopingcut-ofiI valves in coperative relation, the outer one having proper inlet and exhaust ports, the said valves being adapted for an opposite and simultaneous reciprocation, and means for actuating' the said valves.

3. Means for controlling the admission of steam to the piston-cylinder of a steam-engine consisting of an inner and an outer valve arranged in a cylindrical valve-casing' having' inlet and exhaust ports, the said valves being in concentric and cooperative relation, and adapted for a simultaneous reciproca-tion in opposite directions for the purpose described; and means for actuating the said valves.

Signed by us at Fort WTayne, Allen county, State of lfndiana, this 9th day of July, 190%.

EDlVARD F. NEEDHAM. GEORGE W SMITH. litnessesz HERMAN Lenexa, VATTS P. DEXNY. 

